CN106356050A

CN106356050A - Automatic noise elimination method in teaching scene

Info

Publication number: CN106356050A
Application number: CN201610743638.3A
Authority: CN
Inventors: 董涛
Original assignee: Individual
Current assignee: Individual
Priority date: 2016-08-27
Filing date: 2016-08-27
Publication date: 2017-01-25

Abstract

In order to improve the noise elimination effect in the teaching scene, especially to improve the noise reduction effect in a certain natural range, the invention provides an automatic noise elimination method in a teaching scene, comprising: (1) detecting the noise decibels within a predetermined area in the teaching scene; (2) comparing the detected noise decibels with a preset threshold value; and (3) subjecting the stationary noise source and the moving noise source to active noise reduction based on the comparison result. The automatic noise elimination method of the invention is capable of performing active noise reduction on the autonomous moving noise source and overcoming the shortcomings of the prior art in which the technical scheme which can only be used for noise reduction on stationary noise sources is not suitable for practical application, so that the user's noise reduction methods and scope control methods can be expanded, with a broad scope of application and stronger practicality.

Description

Automatization's method of canceling noise under teaching scene

Technical field

The present invention relates to noise processed field, more particularly, to the noise elimination side of automatization under a kind of teaching scene Method.

Background technology

Active noise reduction, refers to gather environmental noise, and produces the playback of the signal anti-phase with noise denoising device, in order to support The technology of noiseless.The noise reduction system of typical active noise reduction (anc) earphone is made up of following part: 1) in order to gather the wheat of noise Gram wind system；2) Electronic Control part, in order to process acoustical signal, and generates de-noising signal；3) horn system, in order to produce fall Make an uproar acoustical signal.Most of anc system adopts one of two kinds of primary structures: feed forward type or reaction type.For example, prior art In, such as Japanese patent application publication No. jp078558a discloses a kind of comfortable sleeping equipment, comprising: be used for supervising located at head both sides Survey the first acoustic pressure monitor of environment acoustic pressure, remain the second acoustic pressure monitor of acoustic pressure near ear, be used for calculating for monitoring One computing unit of acoustic signals and the generation equipment sending this acoustic signals.Environment noise can by acoustic signals offset from And reach the purpose of noise reduction, and the residual acoustic pressure near ear monitored by the second acoustic pressure monitor, can calibrate sound wave letter further Number to improve noise reduction.Although the second acoustic pressure monitor can be calibrated to the acoustic signals of noise reduction, so that the second acoustic pressure prison The acoustic pressure of survey device position is down to minimum.

Existing active noise reduction techniques scheme focuses primarily upon the noise how offsetting stationary sound source.Real life and work In, the movement of noise source brings new challenge to active noise reduction techniques, has movement especially for teaching environment is such In the noise source of formula and fixed noise source and the environment of the echo of at least one in them.Through retrieval, in prior art, Application No. cn200820149499.2 discloses a kind of classroom noise monitoring device, wherein, needs noise monitoring at each It is respectively mounted an audio-switch a, the two ends of each audio-switch a are connected with power supply, respectively in noise monitoring in classroom or dormitory The display lamp c of indoor location is serially connected in the circuit of audio-switch a corresponding thereto respectively.Each noise monitoring switch with Switch b is serially connected with the circuit between power supply.Circuit between each audio-switch and power supply is provided with electric bell.However, should Technology is only for the noise reduction scope of teaching environment noise and effect is all limited.

Content of the invention

In order to improve the noise eradicating efficacy under teaching scene, the region especially improving necessarily natural scope (is for example grasped And school's enclosure wall such as teaching building in the range of region) in noise reduction, the invention provides under a kind of teaching scene from Dynamicization method of canceling noise, carries out sound attenuation for automatically eliminating system by means of teaching environment noise to teaching building, playground, So that teaching environment is relatively quiet, described teaching environment noise automatically eliminates system and includes: teaching scene noise detector unit, At least one fixed noise generation unit, at least one mobile noise source and teaching scene noise reduce equipment, described religion Learn the decibels that scene noise detector unit detects the noise of described fixed noise source and described movable type noise source generation, and Control described teaching scene noise to reduce equipment and carry out active noise reduction, methods described includes:

(1) the noise decibel number in the presumptive area of detection teaching scene；

(2) the described noise decibel number obtaining detection is compared with predetermined threshold value；

(3) according to comparative result, active noise reduction is carried out to fixed noise source and mobile noise source.

Further, described teaching scene noise reduces equipment and includes: interaction interface unit, the first noise reduction unit and the Two noise reduction unit, wherein said interaction interface unit is connected with the first noise reduction unit and the second noise reduction unit respectively, described friendship Mutually interface unit is used for receiving noise reduction from described environmental monitoring system and instructs and control described first noise reduction unit and/or described the Two noise reduction unit carry out active noise reduction, and described first noise reduction unit is used for carrying out active suppression, institute to the noise of mobile noise source The noise reduction unit stating fixed noise source carries out active suppression, described position for the noise of the noise source to position absolutely not change Definitely fixed noise source described in invariant representation is fixed in somewhere locus and this position and does not change over.

Further, described first noise reduction unit includes:

First Noise Acquisition and position associative cell, include the first Noise Acquisition subelement, the first echo acquisition subelement, First electronic chart obtains subelement, the first mark object obtains subelement and associates subelement with primary importance, and wherein said the One Noise Acquisition subelement is used for gathering making an uproar of the whole noise sources in preset range around described equipment first m-th moment Acoustical signal, described first echo obtains subelement and is used for after described first Noise Acquisition subelement completes above-mentioned collection, to institute State the first surrounding preset range to launch ultrasonic signal and gather the echo of this ultrasonic signal, described first electronic chart obtains Subelement is used in the described first surrounding preset range in m-th moment of acquisition, Bao Kuo the electricity that can take action including routing information Sub- map；Described first mark object is obtained subelement and is used for being obtained routing information instruction of can taking action based on described electronic chart Respectively can take action mark on path, being identified on described electronic chart, described primary importance association subelement is used for basis Each noise source that described first mark object is obtained the subelement mark determining, obtained subelement determination based on described first echo Each noise source of determining of echo-signal with respect to the direction of described intelligent tutoring scene monitoring system and distance, set up each and make an uproar One-to-one mapping relations between each mark in sound source and electronic chart, described m is positive integer；

Removable noise source screening unit, for, in the z moment before q-th moment, gathering described whole noises The change in location information in source, to remove, from described whole noise sources, the noise source that position does not change within this z moment, So that the residual noise source in described whole noise source is constituted and alternatively move noise source collection；

Specific removable noise source collection determining unit, for setting band segment interested in described whole noise signals For particular noise signals, concentrate from described alternative mobile noise source and determine that at least one movement sending this particular noise signals is made an uproar Sound source, i.e. specific removable noise source collection；

Can take action path acquiring unit, for obtaining the second surrounding preset range of described environmental monitoring system position Interior taken action routing information, and gather described specific removable noise source collection before n-th moment n-th moment The primary importance information collection in front p moment and before n-th moment collection intelligent tutoring scene monitoring system when n-th The second position information collection in the front p moment carved, described routing information of taking action includes road information, wherein n-m > p, and n and p It is positive integer, described second surrounding preset range belongs to a part for described first surrounding preset range；

Noise source path determining unit, for the taken action routing information being obtained according to described path acquiring unit of taking action And primary importance information collection, each determining by way of matching that this specific removable noise source collection includes be specific removable Noise source (n+1)th moment with respect to described path of taking action the first estimating position information collection, described first estimating position Information collection includes the estimating position information (n+1)th moment for each specific removable noise source；

Intelligent tutoring scene monitoring system path determining unit, for taking action what path acquiring unit obtained according to described Can take action routing information and second position information collection, determine that described intelligent tutoring scene monitoring system exists by way of matching (n+1)th moment is with respect to the second estimating position information in described path of taking action；

Removable noise reduction starts judging unit, the estimated position of first for being obtained according to described noise source path determining unit Confidence breath collection, calculates each the specific removable noise source including in removable noise source collection specific described in (n+1)th moment At least one difference between second estimating position information of position and described intelligent tutoring scene monitoring system, determines this at least Comparative result between one difference and predeterminable range difference, will be less than predeterminable range difference with threshold distance according to this comparative result The specific removable noise source that described specific removable noise source is concentrated is defined as treating the removable noise source of active noise reduction；

First direction adjustment unit, for treating the removable of active noise reduction based on described in the first estimating position information concentration Noise source is expected the second of (n+1)th moment in the position in (n+1)th moment and described intelligent tutoring scene monitoring system Positional information, determines described in the collection of described second Noise Acquisition unit sound when the noise of the removable noise source of active noise reduction Sound sensor towards angle；

Second Noise Acquisition unit, including multiple sound transducers, described second Noise Acquisition unit is used for according to described What first direction adjustment unit determined controls, towards angle, the removable moving noise treating active noise reduction described in described sound transducer collection The noise signal in source, treat described at least one the noise signal of the removable noise source of active noise reduction constitute treat active noise reduction can Mobile noises from noise sources collection；

First suppression frequency spectrum signal generating unit, for be related to according to the removable noises from noise sources collection treating active noise reduction each The noise signal of the described removable noise source treating active noise reduction, accordingly produces the first anti-phase noise signal collection, and this is first anti- Phase noise signal collection includes the multiple first anti-phase noise signals, and the phase place of each first anti-phase noise signal and first anti-phase with this The phase 180 degree of the corresponding described noise signal of removable noise source treating active noise reduction of noise signal；

First synthesis with suppression unit, for (n+1)th moment to the described removable noise source collection treating active noise reduction Each described in treat the removable noise source of active noise reduction, treat active noise reduction according to what described direction adjustment unit determined with this Removable noise source corresponding towards angle, that transmitting is produced by the described first suppression frequency spectrum signal generating unit and described treat actively The corresponding first anti-phase noise signal of removable noise source of noise reduction.

Further, described path acquiring unit of taking action includes gps subelement, for gathering before n-th moment The primary importance information collection in front p moment n-th moment for the described specific removable noise source collection and n-th moment with The second position information collection in the front collection front p moment n-th moment for the intelligent tutoring scene monitoring system.

Further, described second noise reduction unit includes:

Fixed noise source screening unit is in the z moment before q-th moment, complete in collection presumptive area The change in location information of portion's noise source, with making an uproar of removing from described whole noise sources that position within this z moment changes Sound source, makes the residual noise source in described whole noise source constitute alternatively fixed noise source collection, described fixed noise source Position does not change over；

Fixed noise source direction-determining unit, for concentrating from described alternatively fixed noise source, obtains expectation to solid Fixed pattern noise source carries out the assigned direction of active noise reduction；

Gis information acquisition unit, for obtaining described specifying according to described intelligent tutoring scene monitoring system present position The geographical location information of the fixed noise source on direction, and then obtain described fixed noise source with respect to described intelligent tutoring The angle of scene monitoring system, and when described fixed noise source is multiple, this angle is and multiple described fixed noises Source corresponds；

Second direction adjustment unit, for the angle-determining that obtained according to described gis information acquisition unit and adjust the 3rd The Noise Acquisition angle of the sound collection sensor in Noise Acquisition unit；

3rd Noise Acquisition unit, including multiple sound collection sensors, for according to described second direction adjustment unit Adjustment to the acquisition angles of described sound collection sensor, obtains the noise signal of described fixed noise source；

Second suppression frequency spectrum signal generating unit, produces second for the output signal according to described 3rd Noise Acquisition unit anti- Phase noise signal, this second anti-phase noise signal differs 180 degree with the noise signal of described fixed noise source in phase place；

Second synthesis and suppression unit, for sending the described second anti-phase noise signal to described fixed noise source.

Further, described first suppression frequency spectrum signal generating unit includes acoustic-electric converting unit, the noise source trace being one another in series Wave attenuation unit, the first filter unit and the second filter unit, wherein said noise source trace wave attenuation unit, described first filtering Unit and described second filter unit are in sequential series.

Further, described acoustic-electric converting unit adopts transducer.

Further, the noise signal of described second Noise Acquisition unit collection is included in preset range around second Treat the echo that the removable noise source of active noise reduction produces, described noise source trace wave attenuation unit is used for specific removable moving noise The echo of source collection is decayed, comprising: particular noise signals reference spectrum acquiring unit, the echo with particular noise signals exist The frequency spectrum acquiring unit of interior signal, delay acquisition unit, delay unit are poor, and arithmetic element；Wherein said specific noise Signal reference spectrum acquiring unit produces the prearranged signalss being attached to fixed reference feature on the basis of described particular noise signals Frequency spectrum, this prearranged signalss frequency spectrum is imported into described delay acquisition unit；Described delay acquisition unit is used for according to described predetermined The periodic feature of signal spectrum, determines itself phase contrast and the frequency spectrum of described particular noise signals between, and according to this phase place Difference determines the time difference between described particular noise signals and its echo, and described delay unit is according to this time difference to described specific Noise signal enters line delay, and the signal obtaining after time delay is by common in interior signal with the described echo with particular noise signals It is input to described difference operation unit, thus the echo that the described particular noise signals that decay include.

Further, described first filter unit is band filter, and its lower limiting frequency and upper cut off frequency are respectively 5hz and 1800hz.

Further, described second filter unit includes: 3.7k ω resistance, 7.9k ω resistance, 3.2k ω resistance, 10.94k ω resistance, 1.73k ω resistance, 2.52k ω resistance, 6.7k ω resistance, 3.1k ω resistance, 10.1k ω resistance, 2k ω resistance, 4.8k ω resistance, 7.3k ω resistance, 10k ω resistance, 1k ω resistance, 7k ω resistance, 2.2k ω resistance, 4.89k ω resistance, 2.3k ω resistance, 2.32k ω resistance, 2.5k ω resistance, 0.51uf electric capacity, 0.21uf electric capacity, 0.38uf electric capacity, 0.82uf electric capacity, 0.35uf electric capacity, 0.23uf electric capacity, 0.12uf electric capacity, 3.1uf electric capacity, 2uf electric capacity, 0.33uf electric capacity, 2.47uf electric capacity, 0.35uf electric capacity, 0.26uf electric capacity, 0.31uf electric capacity, 0.55uf electric capacity, the first operational amplifier, the second operational amplifier, Three operational amplifiers, four-operational amplifier, the 5th operational amplifier, the 6th operational amplifier, the first Zener diode, second Zener diode, the 3rd Zener diode, the 4th Zener diode, the 5th Zener diode, the 6th Zener diode, the 7th neat Receive diode, the first difference operation unit, and the second difference operation unit, wherein, input the input signal end of signal to be filtered Connect the first end of described 3.7k ω resistance, the first end string of the second end of described 3.7k ω resistance and described 7.9k ω resistance Connection, the second end of described 7.9k ω resistance connects the positive input terminal of described first operational amplifier and described 0.51uf electric capacity respectively First end, the second end ground connection of described 0.51uf electric capacity, the first end of described 7.9k ω resistance is also connected with described 0.21uf electricity The first end held, the second end of described 0.21uf electric capacity connects the outfan of described first operational amplifier, described 3.2k respectively The first end of ω resistance and the negative input end of described first operational amplifier, the first end of described 3.7k ω resistance is also respectively connected with The first end of described 2uf electric capacity, the positive pole of the first Zener diode, the second end of described 2uf electric capacity connects described 3.1k respectively The first end of ω resistance, the positive input terminal of described second operational amplifier, the outfan of described second operational amplifier, described The outfan of two operational amplifiers connects described via the positive pole of described second Zener diode, the negative pole of the second Zener diode The first end of 2k ω resistance and the first end of described 3.2k ω resistance, the second end of described 3.2k ω resistance connects 10k ω respectively The first end of resistance, the negative pole of the 3rd Zener diode, the first end of described 10.94k ω, the first of described 0.82uf electric capacity End, the second end of described 10.94k ω resistance connects the positive input terminal of the 3rd operational amplifier, described 0.38uf electric capacity respectively First end, the second end ground connection of described 0.38uf electric capacity, the second end of described 0.82uf electric capacity connects described 3rd computing respectively The outfan of amplifier, the first end of described 1.73k ω resistance, the negative input end of described 3rd operational amplifier and described The positive pole of three Zener diodes, the second end of described 1.73k ω resistance connect respectively described 2.52k ω resistance first end and The first end of described 0.35uf electric capacity, the second end of described 2.52k ω resistance connects the positive input of four-operational amplifier respectively End and the first end of 0.23uf electric capacity, the second end ground connection of described 0.23uf electric capacity, the second end of described 0.35uf electric capacity is respectively The outfan, the negative input end of described second difference operation unit and described 4th computing that connect described four-operational amplifier are put The negative input end of big device, the positive input terminal of the negative pole connection first difference operation unit of described first Zener diode, described first The positive pole of Zener diode is also respectively connected with the first end of the described 1k ω resistance, negative pole of described 4th Zener diode, described The first end of 7.3k ω resistance, the first end of described 0.33uf electric capacity, the second end of described 7.3k ω resistance connects described 10k ω The first end of resistance, the second end of described 10k ω resistance connects the first end of described 0.35uf electric capacity, described 5th Zener respectively The negative pole of diode, the first end of described 2.3k ω resistance, the second end of described 2.3k ω resistance connects described 0.55uf respectively The first end of the first end of electric capacity, the first end of described 0.31uf electric capacity and 2.32k ω resistance, described 2.32k ω resistance Second end ground connection, the second end of described 0.31uf electric capacity connects the negative input end of described 5th operational amplifier, described respectively The first end of 2.5k ω resistance, the second end of described 2.5k ω resistance connect respectively the second end of described 0.55uf electric capacity, the 5th The outfan of operational amplifier and the positive input terminal of described second difference operation unit, the negative input of described first difference operation unit End connects first end, the first end of described 4.8k ω resistance and described 6th operational amplifier of described 0.12uf electric capacity respectively Outfan, the second end of described 0.12uf electric capacity connect respectively the first end of described 3.1uf electric capacity, the second of 6.7k ω resistance End, the first end of described 10.1k ω resistance, the second end of described 3.1uf electric capacity connects the second of described 4.8k ω resistance respectively End and the negative input end of described 6th operational amplifier, the second end ground connection of described 10.1k ω resistance, described 6.7k ω resistance First end connects the outfan of described second difference operation unit, and the positive input terminal of described 6th operational amplifier connects the described 5th The positive input terminal of operational amplifier, the outfan of described first difference operation unit connect respectively the second end of described 1k ω resistance, The positive pole of described 4th Zener diode, the positive pole of described 6th Zener diode, the first end of described 2.47uf electric capacity, described The first end of 7k ω resistance, the first end of described 2.2k ω resistance, the negative pole of described 6th Zener diode connects described respectively The outfan of the 6th operational amplifier, the second end of described 0.33uf electric capacity, the second end of described 2.2k ω resistance connects respectively The positive pole of the first end of described 0.26uf electric capacity, the positive pole of described 5th Zener diode and described 7th Zener diode and The first end of described 4.89k ω resistance, the second end of described 4.89k ω resistance connects the positive input of described 5th operational amplifier End, the second end of described 2.47uf electric capacity, the second end of described 7k ω resistance, the second end of described 0.35uf electric capacity, described Second end of 0.26uf electric capacity and the minus earth of described 7th Zener diode.

The invention has the beneficial effects as follows:

(1) present invention can carry out active noise reduction to the noise source of autonomous, overcome in prior art and be typically only capable of Enough technical schemes carrying out noise reduction to fixed noise source are unsuitable for the defect of practical application, so that can in teaching scene It is isolated out a more quiet region, breaching prior art cannot carry out active noise reduction and lack to teaching scene areas Fall into；

(2) present invention can by means of teaching scene noise reduce equipment can in movement to other noise in mobile Source carries out active noise reduction so that in certain area (preset range around first being for example mentioned above, predetermined model around second Enclose) really realize the suppression of noise, so that being arranged to suitably individual when the teaching scene noise of the present invention reduces equipment Number when, enter in this region do not configure active noise reduction or the personnel of passive noise reducing apparatus also will not be invaded and harassed by noise；

(3) the teaching scene noise of the present invention reduces the fixed noise source that equipment can also not change over to position Noise, teaching scene noise reduce equipment moving process in carry out active noise reduction, thus provide for user more pacifying Quiet environment；

(4) second filter unit of the present invention combines to the process needed for signal spectrum, can reach following index: set Put band connection frequency fp1=800hz, fp2=4300hz, stop-band frequency fs1=750hz, fs2=4400hz, minimum attenuation in stop band As=70db, passband maximum attenuation ap=3db, are much better than existing simple fir and sef-adapting filter.

(7) well-designed filter unit is coordinated the active noise reduction skill of moveable and fixed noise source by the present invention Art, compares and existing carries out most of technical schemes of active noise reduction so that having the teaching scene of the present invention only for human ear The device of noise reducing apparatus or system have more high sensitivity and noise suppressed degree.

Brief description

The flow chart that Fig. 1 shows the automatization's method of canceling noise according to the present invention.

Fig. 2 shows the circuit diagram of the second filter unit.

Specific embodiment

As shown in figure 1, according to a preferred embodiment of the invention, the invention provides the automatization under a kind of teaching scene makes an uproar Sound removing method, carries out sound attenuation for automatically eliminating system by means of teaching environment noise, and described teaching environment noise is certainly Dynamic elimination system includes: teaching scene noise detector unit, at least one fixed noise generation unit, at least one movement are made an uproar Sound source and teaching scene noise reduce equipment, and described teaching scene noise detector unit detects described fixed noise source and institute State the decibels of the noise that portable noise source produces, and control described teaching scene noise to reduce equipment and carry out active fall Make an uproar, methods described includes:

Each noise source in the present invention is preferably arranged outside teaching scene, for example, be arranged at outside school's enclosure wall Portion.

Wherein, described teaching scene noise detector unit include multiple sonic transducers being one another in series and with the plurality of sound The comparison circuit of the output series connection of sensor, described sonic transducer is used for detecting the signal of telecommunication of described teaching scene noise, described Accumulated value (that is, the value obtaining of the suing for peace) size and predetermined threshold value between that comparison circuit is used for comparing this described signal of telecommunication is closed System: when exceeding default threshold value, represent that the current noise decibel number of teaching scene is too high, need using teaching scene noise fall Low equipment carries out noise reduction.In order to preferably carry out noise reduction, present invention employs the thought of active noise reduction.

According to a preferred embodiment of the invention, as shown in Fig. 2 described teaching scene noise reduces equipment and includes: interaction connects Mouthful unit, the first noise reduction unit and the second noise reduction unit, wherein said interaction interface unit respectively with the first noise reduction unit with And second noise reduction unit connect, described interaction interface unit be used for from described environmental monitoring system receive noise reduction instruct and control institute State the first noise reduction unit and/or described second noise reduction unit carries out active noise reduction, described first noise reduction unit is used for movement is made an uproar The noise of sound source carries out active suppression, and the noise reduction unit of described fixed noise source is used for the noise source to position absolutely not change Noise carries out active suppression, and fixed noise source described in the absolute invariant representation in described position is fixed in somewhere locus and should Position does not change over.

According to a preferred embodiment of the invention, described interaction interface unit includes communicate subelement, touch subunit, instruction Conversion unit of protocol and driver element, described communication subelement is apolegamy.Communication subelement be used for receiving outside be transferred to described Intelligent tutoring scene monitoring system carries out noise reduction whether control instruction and (is equivalent to the intelligent tutoring field whether opening the present invention The instruction of scape monitoring system) and to fixed noise source and/or move the finger that noise source carries out the mode of operations such as active noise reduction Order, its telecommunication circuit can be from the communication module based on one of gprs, 3g, 4g.Described touch subunit is used for receiving use Person is input to above-mentioned each instruction of the intelligent tutoring scene monitoring system of the present invention when participating in the cintest, is taught in described intelligence with convenient use person Learn and remain able to when the communication subelement being carried out telecommunication with outside is not configured on scene monitoring system control described intelligence to teach Learn unlatching and the mode of operation of scene monitoring system.Described command protocols converting unit is used for according to communication protocol set in advance (the various agreements for example, being related in the communication process including compression algorithm, cryptographic protocol, gprs/3g/4g etc.) are to receiving Data enter row format conversion, for described driver element Direct Recognition.This communication Protocol Conversion unit is preferably integrated with The parsing of the relevant data of the mode of operation of this intelligent tutoring scene monitoring system, to obtain indicating whether to open this environmental monitoring System and open the first noise reduction unit and/or open the second noise reduction unit, can be by described driver element Direct Recognition Control word.Described driver element is used for being connected respectively with described first noise reduction unit and described second noise reduction unit, with according to institute State the output of command protocols converting unit, described first noise reduction unit and/or described second noise reduction unit are opened.

Drive circuit (the driving of the agreement such as such as rs485, rs232, usb, i2c that above-mentioned agreement and driver element are related to Circuit) it is that those skilled in the art design according to actual design demand, its role is the base of these agreements and unit This function will not be described here.

Below, the concrete structure of the first noise reduction unit and the second noise reduction unit is described in detail.

Described first noise reduction unit includes:

Described path acquiring unit of taking action includes gps subelement, for gathered before n-th moment described specific can Move the primary importance information collection in the front p moment n-th moment for the noise source collection and gather intelligence before n-th moment The second position information collection in the teaching front p moment n-th moment for the scene monitoring system.

Described second noise reduction unit includes:

Described first suppression frequency spectrum signal generating unit includes acoustic-electric converting unit, the noise source trace wave attenuation list being one another in series Unit, the first filter unit and the second filter unit, wherein said noise source trace wave attenuation unit, described first filter unit and institute State the second filter unit in sequential series.

Described acoustic-electric converting unit adopts transducer.

The noise signal of described second Noise Acquisition unit collection includes treating in preset range around second and actively drops The echo that the removable noise source made an uproar produces, described noise source trace wave attenuation unit is used for specific removable noise source collection is returned Sound is decayed, comprising: particular noise signals reference spectrum acquiring unit, have the echo of particular noise signals in interior signal Frequency spectrum acquiring unit, delay acquisition unit, delay unit poor, and arithmetic element；Wherein said particular noise signals reference Frequency spectrum acquiring unit produces the prearranged signalss frequency spectrum being attached to fixed reference feature on the basis of described particular noise signals, and this is pre- Determine signal spectrum and be imported into described delay acquisition unit；Described delay acquisition unit is used for according to described prearranged signalss frequency spectrum Periodic feature, determines itself phase contrast and the frequency spectrum of described particular noise signals between, and according to this phase contrast determines Time difference between particular noise signals and its echo, described delay unit enters to described particular noise signals according to this time difference Line delay, the signal obtaining after time delay is described in being jointly input in interior signal with the described echo with particular noise signals Difference operation unit, thus the echo that the described particular noise signals that decay include.

Preferably, described first filter unit is band filter, and its lower limiting frequency and upper cut off frequency are respectively 5hz And 1800hz.

Preferably, described second filter unit includes: 3.7k ω resistance, 7.9k ω resistance, 3.2k ω resistance, 10.94k ω Resistance, 1.73k ω resistance, 2.52k ω resistance, 6.7k ω resistance, 3.1k ω resistance, 10.1k ω resistance, 2k ω resistance, 4.8k ω resistance, 7.3k ω resistance, 10k ω resistance, 1k ω resistance, 7k ω resistance, 2.2k ω resistance, 4.89k ω resistance, 2.3k ω electricity Resistance, 2.32k ω resistance, 2.5k ω resistance, 0.51uf electric capacity, 0.21uf electric capacity, 0.38uf electric capacity, 0.82uf electric capacity, 0.35uf Electric capacity, 0.23uf electric capacity, 0.12uf electric capacity, 3.1uf electric capacity, 2uf electric capacity, 0.33uf electric capacity, 2.47uf electric capacity, 0.35uf electricity Appearance, 0.26uf electric capacity, 0.31uf electric capacity, 0.55uf electric capacity, the first operational amplifier, the second operational amplifier, the 3rd computing are put Big device, four-operational amplifier, the 5th operational amplifier, the 6th operational amplifier, the first Zener diode, the second Zener two pole Pipe, the 3rd Zener diode, the 4th Zener diode, the 5th Zener diode, the 6th Zener diode, the 7th Zener two pole Pipe, the first difference operation unit, and the second difference operation unit, wherein, the input signal end inputting signal to be filtered connects institute State the first end of 3.7k ω resistance, connected with the first end of described 7.9k ω resistance in the second end of described 3.7k ω resistance, described Second end of 7.9k ω resistance connects the positive input terminal of described first operational amplifier and the first of described 0.51uf electric capacity respectively End, the second end ground connection of described 0.51uf electric capacity, the first end of described 7.9k ω resistance is also connected with the of described 0.21uf electric capacity One end, the second end of described 0.21uf electric capacity connects the outfan of described first operational amplifier, described 3.2k ω resistance respectively First end and described first operational amplifier negative input end, the first end of described 3.7k ω resistance is also respectively connected with described The first end of 2uf electric capacity, the positive pole of the first Zener diode, the second end of described 2uf electric capacity connects described 3.1k ω electricity respectively The first end of resistance, the positive input terminal of described second operational amplifier, the outfan of described second operational amplifier, described second fortune Calculate the positive pole via described second Zener diode for the outfan of amplifier, the negative pole of the second Zener diode connects described 2k ω The first end of resistance and the first end of described 3.2k ω resistance, the second end of described 3.2k ω resistance connects 10k ω resistance respectively First end, the negative pole of the 3rd Zener diode, the first end of described 10.94k ω, the first end of described 0.82uf electric capacity, institute The second end stating 10.94k ω resistance connect respectively the positive input terminal of the 3rd operational amplifier, the first of described 0.38uf electric capacity End, the second end ground connection of described 0.38uf electric capacity, the second end of described 0.82uf electric capacity connects described 3rd operation amplifier respectively The outfan of device, the first end of described 1.73k ω resistance, the negative input end of described 3rd operational amplifier and described 3rd neat Receive the positive pole of diode, the second end of described 1.73k ω resistance connects the first end of described 2.52k ω resistance and described respectively The first end of 0.35uf electric capacity, the second end of described 2.52k ω resistance connect respectively four-operational amplifier positive input terminal and The first end of 0.23uf electric capacity, the second end ground connection of described 0.23uf electric capacity, the second end of described 0.35uf electric capacity connects respectively The outfan of described four-operational amplifier, the negative input end of described second difference operation unit and described four-operational amplifier Negative input end, the negative pole of described first Zener diode connects the positive input terminal of the first difference operation unit, described first Zener The positive pole of diode is also respectively connected with the first end of described 1k ω resistance, the negative pole of described 4th Zener diode, described 7.3k The first end of ω resistance, the first end of described 0.33uf electric capacity, the second end of described 7.3k ω resistance connects described 10k ω resistance First end, the second end of described 10k ω resistance connects the first end of described 0.35uf electric capacity, described 5th Zener two pole respectively The negative pole of pipe, the first end of described 2.3k ω resistance, the second end of described 2.3k ω resistance connects described 0.55uf electric capacity respectively First end, the first end of described 0.31uf electric capacity and 2.32k ω resistance first end, the second of described 2.32k ω resistance End ground connection, the second end of described 0.31uf electric capacity connects the negative input end of described 5th operational amplifier, described 2.5k ω respectively The first end of resistance, the second end of described 2.5k ω resistance connects the second end of described 0.55uf electric capacity respectively, the 5th computing is put The big outfan of device and the positive input terminal of described second difference operation unit, the negative input end of described first difference operation unit is respectively Connect the output of the first end, the first end of described 4.8k ω resistance and described 6th operational amplifier of described 0.12uf electric capacity End, the second end of described 0.12uf electric capacity connects the first end of described 3.1uf electric capacity, the second end of 6.7k ω resistance, institute respectively State the first end of 10.1k ω resistance, the second end of described 3.1uf electric capacity connects the second end and the institute of described 4.8k ω resistance respectively State the negative input end of the 6th operational amplifier, the second end ground connection of described 10.1k ω resistance, the first end of described 6.7k ω resistance Connect the outfan of described second difference operation unit, the positive input terminal of described 6th operational amplifier connects described 5th computing and puts The positive input terminal of big device, the outfan of described first difference operation unit connect respectively the second end of described 1k ω resistance, described the The positive pole of four Zener diodes, the positive pole of described 6th Zener diode, the first end of described 2.47uf electric capacity, described 7k ω electricity The first end of resistance, the first end of described 2.2k ω resistance, the negative pole of described 6th Zener diode connects described 6th fortune respectively Calculate the outfan of amplifier, the second end of described 0.33uf electric capacity, the second end of described 2.2k ω resistance connects described respectively The positive pole of the first end of 0.26uf electric capacity, the positive pole of described 5th Zener diode and described 7th Zener diode and described The first end of 4.89k ω resistance, the second end of described 4.89k ω resistance connects the positive input terminal of described 5th operational amplifier, Second end of described 2.47uf electric capacity, the second end of described 7k ω resistance, the second end of described 0.35uf electric capacity, described 0.26uf Second end of electric capacity and the minus earth of described 7th Zener diode.

According to a preferred embodiment of the invention, each difference operation unit described can select subtractor.

The narration made for presently preferred embodiments of the present invention above is the purpose for illustrating, and is not intended to limit present invention essence It is really disclosed form, learn and make an amendment or change to be possible based on above teaching or from embodiments of the invention , embodiment is for explaining the principle of the present invention and allowing those skilled in the art to exist using the present invention with various embodiments Select in practical application and describe, the technological thought attempt of the present invention to be determined by claim and its equalization.

Claims

1. the automatization's method of canceling noise under a kind of teaching scene, enters for automatically eliminating system by means of teaching environment noise Row noise is decayed, and described teaching environment noise automatically eliminates system and include: teaching scene noise detector unit, at least one fixes Formula noise generation unit, at least one mobile noise source and teaching scene noise reduce equipment, described teaching scene noise inspection Survey the decibels that unit detects the noise of described fixed noise source and described movable type noise source generation, and control described teaching Scene noise reduces equipment and carries out active noise reduction, and methods described includes:

2. automatization according to claim 1 method of canceling noise is it is characterised in that the reduction of described teaching scene noise sets Standby include: interaction interface unit, the first noise reduction unit and the second noise reduction unit, wherein said interaction interface unit is respectively with the One noise reduction unit and the second noise reduction unit connect, and described interaction interface unit is used for receiving noise reduction from described environmental monitoring system Instruct and control described first noise reduction unit and/or described second noise reduction unit to carry out active noise reduction, described first noise reduction unit For the noise moving noise source is carried out with active suppression, the noise reduction unit of described fixed noise source is used for position absolutely not The noise of the noise source becoming carries out active suppression, and fixed noise source described in the absolute invariant representation in described position is fixed in somewhere Locus and this position does not change over.

3. automatization according to claim 2 method of canceling noise is it is characterised in that described first noise reduction unit includes:

First Noise Acquisition and position associative cell, include the first Noise Acquisition subelement, the first echo acquisition subelement, first Electronic chart obtains subelement, the first mark object obtains subelement and associates subelement with primary importance, and wherein said first makes an uproar Sound gathers the noise letter that subelement is used for the whole noise sources in preset range around the m-th described equipment first of moment collection Number, described first echo obtains subelement and is used for after described first Noise Acquisition subelement completes above-mentioned collection, to described the One surrounding preset range is launched ultrasonic signal and is gathered the echo of this ultrasonic signal, and it is single that described first electronic chart obtains son Unit for obtain m-th moment described first surrounding preset range in, including routing information of can taking action electronically Figure；Described first mark object is obtained subelement and is used for being obtained respectively may be used of routing information instruction of can taking action based on described electronic chart Mark on action path, being identified on described electronic chart, described primary importance association subelement is used for according to described First mark object obtains the mark of subelement determination, obtains returning of each noise source that subelement determines based on described first echo Each noise source that ripple signal determines with respect to the direction of described automatization method of canceling noise and distance, set up each noise source with One-to-one mapping relations between each mark on electronic chart, described m is positive integer；

Removable noise source screening unit, for, in the z moment before q-th moment, gathering described whole noise sources Change in location information, to remove, from described whole noise sources, the noise source that position does not change within this z moment, makes institute The residual noise source in whole noise sources of stating is constituted alternatively moves noise source collection；

Specific removable noise source collection determining unit, for being set to spy by band segment interested in described whole noise signals Determine noise signal, concentrate from described alternative mobile noise source and determine at least one the mobile noise sending this particular noise signals Source, i.e. specific removable noise source collection；

Can take action path acquiring unit, for obtaining in the second surrounding preset range of described environmental monitoring system position Can take action routing information, and gather the front p n-th moment for the described specific removable noise source collection before n-th moment The primary importance information collection in individual moment and before n-th moment collection intelligent tutoring scene monitoring system n-th moment The front p moment second position information collection, described routing information of taking action includes road information, wherein n-m > p, and n and p is equal For positive integer, described second surrounding preset range belongs to a part for described first surrounding preset range；

Noise source path determining unit, for the taken action routing information that obtained according to the described path acquiring unit of taking action and Primary importance information collection, determines each specific removable moving noise that this specific removable noise source collection includes by way of matching Source (n+1)th moment with respect to described path of taking action the first estimating position information collection, described first estimating position information Collection includes the estimating position information (n+1)th moment for each specific removable noise source；

Intelligent tutoring scene monitoring system path determining unit, feasible for obtained according to described path acquiring unit of taking action Dynamic routing information and second position information collection, determined by way of matching described intelligent tutoring scene monitoring system n-th+ 1 moment is with respect to the second estimating position information in described path of taking action；

Removable noise reduction starts judging unit, for the first estimating position letter being obtained according to described noise source path determining unit Breath collection, calculates the position of each the specific removable noise source including in removable noise source collection specific described in (n+1)th moment At least one difference and the second estimating position information of described intelligent tutoring scene monitoring system between, determines this at least one Comparative result between difference and predeterminable range difference, will be less than described in predeterminable range difference with threshold distance according to this comparative result The specific removable noise source that specific removable noise source is concentrated is defined as treating the removable noise source of active noise reduction；

First direction adjustment unit, for based on the removable moving noise treating active noise reduction described in the first estimating position information concentration Source the position in (n+1)th moment and described intelligent tutoring scene monitoring system (n+1)th moment the second estimating position Information, determine described second Noise Acquisition unit collection described in when the noise of the removable noise source of active noise reduction sound sensor Device towards angle；

Second Noise Acquisition unit, including multiple sound transducers, described second Noise Acquisition unit is used for according to described first What direction adjustment unit determined controls, towards angle, the removable noise source treating active noise reduction described in described sound transducer collection Noise signal, treats described at least one that the noise signal of the removable noise source of active noise reduction is constituted and treats the removable of active noise reduction Noises from noise sources collection；

First suppression frequency spectrum signal generating unit, for be related to according to the removable noises from noise sources collection treating active noise reduction each described in Treat the noise signal of the removable noise source of active noise reduction, accordingly produce the first anti-phase noise signal collection, this first anti-phase is made an uproar Acoustical signal collection includes the multiple first anti-phase noise signals, and the phase place of each first anti-phase noise signal and with this first anti-phase noise The phase 180 degree of the corresponding described noise signal of removable noise source treating active noise reduction of signal；

First synthesis and suppression unit, for every to the described removable noise source collection treating active noise reduction (n+1)th moment Treat the removable noise source of active noise reduction described in one, determine according to described direction adjustment unit with this treat active noise reduction can Mobile noise source corresponding towards angle, that transmitting is produced by the described first suppression frequency spectrum signal generating unit and described treat active noise reduction The corresponding first anti-phase noise signal of removable noise source.

4. automatization according to claim 3 method of canceling noise is it is characterised in that described path acquiring unit of taking action Including gps subelement, for gathering described specific removable noise source collection before n-th moment at front p of n-th moment The primary importance information collection in moment and before n-th moment collection intelligent tutoring scene monitoring system n-th moment The second position information collection in front p moment.

5. the automatization's method of canceling noise according to one of claim 1-4 is it is characterised in that described second noise reduction unit Including:

Fixed noise source screening unit, for, in the z moment before q-th moment, all making an uproar in collection presumptive area The change in location information of sound source, to remove, from described whole noise sources, the noise source that position changes within this z moment, The residual noise source in described whole noise source is made to constitute alternatively fixed noise source collection, the position of described fixed noise source is not Change over；

Fixed noise source direction-determining unit, for concentrating from described alternatively fixed noise source, obtains expectation to fixed Noise source carries out the assigned direction of active noise reduction；

Gis information acquisition unit, for obtaining described assigned direction according to described intelligent tutoring scene monitoring system present position On fixed noise source geographical location information, and then obtain described fixed noise source with respect to described intelligent tutoring scene The angle of monitoring system, and when described fixed noise source is multiple, this angle is and multiple described fixed noise sources one One is corresponding；

Second direction adjustment unit, for the angle-determining that obtained according to described gis information acquisition unit and adjust the 3rd noise The Noise Acquisition angle of the sound collection sensor in collecting unit；

3rd Noise Acquisition unit, including multiple sound collection sensors, for according to described second direction adjustment unit to institute State the adjustment of the acquisition angles of sound collection sensor, obtain the noise signal of described fixed noise source；

Second suppression frequency spectrum signal generating unit, anti-phase makes an uproar for producing second according to the output signal of described 3rd Noise Acquisition unit Acoustical signal, this second anti-phase noise signal differs 180 degree with the noise signal of described fixed noise source in phase place；

6. the automatization's method of canceling noise according to claim 3 or 4 is it is characterised in that described first suppression frequency spectrum is given birth to Become acoustic-electric converting unit, noise source trace wave attenuation unit, the first filter unit and the second filtering that unit includes being one another in series single Unit, wherein said noise source trace wave attenuation unit, described first filter unit and described second filter unit are in sequential series.

7. automatization according to claim 6 method of canceling noise is it is characterised in that described acoustic-electric converting unit is using changing Can device.

8. automatization according to claim 6 method of canceling noise is it is characterised in that described second Noise Acquisition unit is adopted The noise signal of collection includes the echo that the removable noise source treating active noise reduction in preset range around second produces, described Noise source trace wave attenuation unit is used for the echo of specific removable noise source collection is decayed, comprising: particular noise signals are joined Examine frequency spectrum acquiring unit, the frequency spectrum acquiring unit in interior signal for the echo with particular noise signals, delay acquisition unit, prolong Shi Danyuan is poor, and arithmetic element；Wherein said particular noise signals reference spectrum acquiring unit produces in described specific noise It is attached to the prearranged signalss frequency spectrum of fixed reference feature, this prearranged signalss frequency spectrum is imported into described delay acquisition on the basis of signal Unit；Described delay acquisition unit is used for according to the periodic feature of described prearranged signalss frequency spectrum, determines that it specific is made an uproar with described Phase contrast between the frequency spectrum of acoustical signal, and the time between described particular noise signals and its echo is determined according to this phase contrast Difference, described delay unit enters line delay according to this time difference to described particular noise signals, the signal obtaining after time delay by with institute State and there is the echo of particular noise signals be jointly input to described difference operation unit in interior signal, thus described specific make an uproar of decaying The echo that acoustical signal includes.

9. automatization according to claim 8 method of canceling noise is it is characterised in that described first filter unit is band logical Wave filter, its lower limiting frequency and upper cut off frequency are respectively 5hz and 1800hz.

10. automatization according to claim 9 method of canceling noise is it is characterised in that described second filter unit includes: 3.7k ω resistance, 7.9k ω resistance, 3.2k ω resistance, 10.94k ω resistance, 1.73k ω resistance, 2.52k ω resistance, 6.7k ω Resistance, 3.1k ω resistance, 10.1k ω resistance, 2k ω resistance, 4.8k ω resistance, 7.3k ω resistance, 10k ω resistance, 1k ω electricity Resistance, 7k ω resistance, 2.2k ω resistance, 4.89k ω resistance, 2.3k ω resistance, 2.32k ω resistance, 2.5k ω resistance, 0.51uf electricity Appearance, 0.21uf electric capacity, 0.38uf electric capacity, 0.82uf electric capacity, 0.35uf electric capacity, 0.23uf electric capacity, 0.12uf electric capacity, 3.1uf electricity Appearance, 2uf electric capacity, 0.33uf electric capacity, 2.47uf electric capacity, 0.35uf electric capacity, 0.26uf electric capacity, 0.31uf electric capacity, 0.55uf electric capacity, First operational amplifier, the second operational amplifier, the 3rd operational amplifier, four-operational amplifier, the 5th operational amplifier, Six operational amplifiers, the first Zener diode, the second Zener diode, the 3rd Zener diode, the 4th Zener diode, the 5th Zener diode, the 6th Zener diode, the 7th Zener diode, the first difference operation unit, and the second difference operation unit, its In, the input signal end that inputs signal to be filtered connects the first end of described 3.7k ω resistance, and the of described 3.7k ω resistance Connected with the first end of described 7.9k ω resistance in two ends, the second end of described 7.9k ω resistance connects described first computing respectively and puts The big positive input terminal of device and the first end of described 0.51uf electric capacity, the second end ground connection of described 0.51uf electric capacity, described 7.9k ω The first end of resistance is also connected with the first end of described 0.21uf electric capacity, and the second end of described 0.21uf electric capacity connects described respectively The negative input end of the outfan of one operational amplifier, the first end of described 3.2k ω resistance and described first operational amplifier, institute The first end stating 3.7k ω resistance is also respectively connected with the first end of described 2uf electric capacity, the positive pole of the first Zener diode, described Second end of 2uf electric capacity connects the first end of described 3.1k ω resistance, the positive input terminal of described second operational amplifier, institute respectively State the outfan of the second operational amplifier, the outfan of described second operational amplifier is via described second Zener diode just Pole, the negative pole of the second Zener diode connect the first end of described 2k ω resistance and the first end of described 3.2k ω resistance, described Second end of 3.2k ω resistance connects the first end of 10k ω resistance, the negative pole of the 3rd Zener diode, described 10.94k ω respectively First end, the first end of described 0.82uf electric capacity, the second end of described 10.94k ω resistance connects the 3rd operation amplifier respectively The positive input terminal of device, the first end of described 0.38uf electric capacity, the second end ground connection of described 0.38uf electric capacity, described 0.82uf electric capacity The second end connect the outfan of described 3rd operational amplifier, the first end of described 1.73k ω resistance, described 3rd fortune respectively Calculate the negative input end of amplifier and the positive pole of described 3rd Zener diode, the second end of described 1.73k ω resistance connects respectively Connect the first end of described 2.52k ω resistance and the first end of described 0.35uf electric capacity, the second end of described 2.52k ω resistance is divided Do not connect the positive input terminal of four-operational amplifier and the first end of 0.23uf electric capacity, the second termination of described 0.23uf electric capacity Ground, the second end of described 0.35uf electric capacity connects the outfan of described four-operational amplifier, described second difference operation list respectively The negative input end of unit and the negative input end of described four-operational amplifier, the negative pole of described first Zener diode connects first The positive input terminal of difference operation unit, the positive pole of described first Zener diode be also respectively connected with the first end of described 1k ω resistance, The negative pole of described 4th Zener diode, the first end of described 7.3k ω resistance, the first end of described 0.33uf electric capacity, described Second end of 7.3k ω resistance connects the first end of described 10k ω resistance, and the second end of described 10k ω resistance connects described respectively The first end of 0.35uf electric capacity, the negative pole of described 5th Zener diode, the first end of described 2.3k ω resistance, described 2.3k ω Second end of resistance connects first end, the first end of described 0.31uf electric capacity and the 2.32k ω of described 0.55uf electric capacity respectively The first end of resistance, the second end ground connection of described 2.32k ω resistance, the second end of described 0.31uf electric capacity connects described the respectively The negative input end of five operational amplifiers, the first end of described 2.5k ω resistance, the second end of described 2.5k ω resistance connects respectively The positive input at the second end of described 0.55uf electric capacity, the outfan of the 5th operational amplifier and described second difference operation unit End, the negative input end of described first difference operation unit connects the first end of described 0.12uf electric capacity, described 4.8k ω resistance respectively First end and described 6th operational amplifier outfan, the second end of described 0.12uf electric capacity connects described 3.1uf respectively The first end of electric capacity, the second end of 6.7k ω resistance, the first end of described 10.1k ω resistance, the second end of described 3.1uf electric capacity Connect the second end of described 4.8k ω resistance and the negative input end of described 6th operational amplifier, described 10.1k ω resistance respectively The second end ground connection, the first end of described 6.7k ω resistance connects the outfan of described second difference operation unit, described 6th fortune The positive input terminal calculating amplifier connects the positive input terminal of described 5th operational amplifier, the outfan of described first difference operation unit Just connect the second end of described 1k ω resistance, the positive pole of described 4th Zener diode, described 6th Zener diode respectively Pole, the first end of described 2.47uf electric capacity, the first end of described 7k ω resistance, the first end of described 2.2k ω resistance, described The negative pole of six Zener diodes connects the outfan of described 6th operational amplifier, the second end of described 0.33uf electric capacity respectively, Second end of described 2.2k ω resistance connects the first end of described 0.26uf electric capacity, the positive pole of described 5th Zener diode respectively And the positive pole of described 7th Zener diode and the first end of described 4.89k ω resistance, the second end of described 4.89k ω resistance Connect the positive input terminal of described 5th operational amplifier, the second end of described 2.47uf electric capacity, the second end of described 7k ω resistance, The negative pole at the second end of described 0.35uf electric capacity, the second end of described 0.26uf electric capacity and described 7th Zener diode connects Ground.